3 Steps to Download and Fix Wmcoinst.dll DLL Errors

Last Updated: 09/12/2018
[Average Read Time: 4.5 minutes]

Wmcoinst.dll, also known as a ActiveSync CoInstaller file, was created by Microsoft for the development of Microsoft® Windows® Operating System. DLL files fall under under the Win64 DLL (Dynamic link library) file type category.

The release of wmcoinst.dll introduced for Windows was on 11/08/2006 in Windows Vista. This file marks the latest update from Microsoft, according to our records.

Please see below for more detailed information, DLL file troubleshooting instructions, and free downloads of different versions of wmcoinst.dll.

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File Overview

General Information
File Name: wmcoinst.dll
File Extension: DLL file extension
Description: ActiveSync CoInstaller
Object File Type: Dynamic link library
File Operating System: Windows NT 32-bit
MIME Type: application/octet-stream
User Popularity Rating:
Developer and Software Information
Software Developer: Microsoft Corporation
Software Program: Microsoft® Windows® Operating System
Legal Copyright: © Microsoft Corporation. All rights reserved.
File Details
Character Set: Unicode
Language Code: English (U.S.)
File Flags: (none)
File Flags Mask: 0x003f
Entry Point: 0x4bb4
Code Size: 19456

What are wmcoinst.dll Error Messages?

Dynamic Link Library wmcoinst.dll Errors

Wmcoinst.dll is considered a type of Dynamic Link Library (DLL) file. Dynamic Link Library files, like wmcoinst.dll, are essentially a "guide book" that stores information and instructions for executable (EXE) files - like sapisvr.exe - to follow. These files were created so that multiple programs (eg. Windows) could share the same wmcoinst.dll file, saving valuable memory allocation, therefore making your computer run more efficiently.

Unfortunately, what makes DLL files so convenient and efficient, also makes them extremely vulnerable to problems. If something happens to a shared DLL file, either it goes missing or gets corrupted in some way, it can generate a "runtime" error message. Runtime is pretty self-explanatory; it means that these errors are triggered when wmcoinst.dll is attempted to be loaded either when Windows is starting up, or in some cases already running. Some of the most common wmcoinst.dll errors include:

Your wmcoinst.dll file could be missing due to accidental deletion, uninstalled as a shared file of another program (shared with Windows), or deleted by a malware infection. Furthermore, wmcoinst.dll file corruption could be caused from a power outage when loading Windows, system crash while loading wmcoinst.dll, bad sectors on your storage media (usually your primary hard drive), or quite commonly, a malware infection. Thus, it's critical to make sure your anti-virus is kept up-to-date and scanning regularly.

How to Fix wmcoinst.dll Errors in 3 Steps (Time to complete: ~5-15 minutes)

If you're encountering one of the error messages above, follow these troubleshooting steps to resolve your wmcoinst.dll issue. These troubleshooting steps are listed in the recommended order of execution.

Step 1: Restore your PC back to the latest restore point, "snapshot", or backup image before error occurred.

To begin System Restore (Windows XP, Vista, 7, 8, and 10):

  1. Hit the Windows Start button
  2. When you see the search box, type "System Restore" and press "ENTER".
  3. In the search results, find and click System Restore.
  4. Please enter the administrator password (if applicable / prompted).
  5. Follow the steps in the System Restore Wizard to choose a relevant restore point.
  6. Restore your computer to that backup image.

If the Step 1 fails to resolve the wmcoinst.dll error, please proceed to the Step 2 below.

Step 2: Run SFC (System File Checker) to restore the corrupt or missing wmcoinst.dll file.

System File Checker is a utility included with every Windows version that allows you scan and restore corrupted system files. Use the SFC tool to fix missing or corrupt wmcoinst.dll files (Windows XP, Vista, 7, 8, and 10):

  1. Hit the Windows Start button
  2. In the search box, type "cmd" but DO NOT PRESS "ENTER".
  3. Press and hold "CTRL-Shift" on your keyboard while pressing "ENTER".
  4. You'll be prompted with a permission dialog box.
  5. In the box, click "YES".
  6. You should have a black screen with a blinking cursor.
  7. In that black screen, type "sfc /scannow" and hit "ENTER".
  8. SFC will begin scanning for wmcoinst.dll issues and any other system file problems.
  9. Follow any on-screen commands to complete the process.

Please be aware that this scan might take a while, so please be patient while it is working.

If this Step 2 fails as well, please proceed to the Step 3 below.

sfc /scannow

Step 3: Perform a Windows Update.

When the first two steps haven't solved your issue, it might be a good idea to run Windows Update. Many wmcoinst.dll error messages that are encountered can be contributed to an outdated Windows Operating System. To run Windows Update, please follow these easy steps:

  1. Hit the Windows Start button
  2. In the search box, type "Update" and press "ENTER".
  3. In the Windows Update dialog box, click "Check for Updates" (or similar button depending on your Windows version)
  4. If updates are available for download, click "Install Updates".
  5. After the update is completed, restart your PC.

If Windows Update failed to resolve the wmcoinst.dll error message, please proceed to next step. Please note that this final step is recommended for advanced PC users only.

If Those Steps Fail: Download and Replace Your wmcoinst.dll File (Caution: Advanced)

If none of the previous three troubleshooting steps have resolved your issue, you can try a more aggressive approach (Note: Not recommended for amateur PC users) by downloading and replacing your appropriate wmcoinst.dll file version. We maintain a comprehensive database of 100% malware-free wmcoinst.dll files for every applicable version of Windows. Please follow the steps below to download and properly replace you file:

  1. Locate your Windows operating system version in the list of below "Download wmcoinst.dll Files".
  2. Click the appropriate "Download Now" button and download your Windows file version.
  3. Copy the file into the appropriate directory for your Windows version:

  4. Windows Vista: C:\Windows\System32\DriverStore\FileRepository\winmobil.inf_4e416d9f\
    Windows Vista: C:\Windows\System32\DriverStore\FileRepository\winmobil.inf_e19c65de\
    Windows Vista: C:\Windows\System32\DriverStore\FileRepository\winmobil.inf_fd23a282\
  5. Restart your computer.

If this final step has failed and you're still encountering the error, you're only remaining option is to do a clean installation of Windows Vista.

GEEK TIP : We must emphasize that reinstalling Windows will be a very time-consuming and advanced task to resolve wmcoinst.dll problems. To avoid data loss, you must be sure that you have backed-up all of your important documents, pictures, software installers, and other personal data before beginning the process. If you are not currently backing up your data, you need to do so immediately.

Download wmcoinst.dll Files (Malware-Tested 100% Clean)

CAUTION : We strongly advise against downloading and copying wmcoinst.dll to your appropriate Windows system directory. Microsoft typically does not release Windows DLL files for download because they are bundled together inside of a software installer. The installer's task is to ensure that all correct verifications have been made before installing and placing wmcoinst.dll and all other DLL files for Windows. An incorrectly installed DLL file may create system instability and could cause your program or operating system to stop functioning altogether. Proceed with caution.

Windows Vista

Files Related to wmcoinst.dll

DLL Files Related to wmcoinst.dll

File Name Description Software Program (Version) File Size (bytes) File Location
udhisapi.dll UPnP Device Host ISAPI Extension Microsoft® Windows® Operating System (6.2.9200.16384) 55296 C:\Windows\System32\
tbs.dll TBS Microsoft® Windows® Operating System (6.2.9200.16384) 13312 C:\Windows\System32\
dxmasf.dll Microsoft Windows Media Component Removal File. Microsoft® Windows® Operating System (12.0.15063.0) 5632 C:\Windows\System32\
MIGUIControls.resource... Dynamic Link Library Windows 8.1 1542656 C:\Windows\Microsoft.NET\assembly\GAC_MSIL\Migu...
MSWB70404.dll MSWB7EA DLL Microsoft® Windows® Operating System (6.3.9600.17415) 524800 C:\Windows\System32\

Other Files Related to wmcoinst.dll

File Name Description Software Program (Version) File Size (bytes) File Location
taskschd.dll.mui Task Scheduler COM API Microsoft® Windows® Operating System (6.2.9200.16384) 7168 C:\Windows\System32\en-US\
mdmosi.inf Setup Information Windows XP 31555 C:\Windows\inf\
accessibilitycpl.dll.mui Ease of access control panel Microsoft® Windows® Operating System (6.3.9600.16384) 36864 C:\Windows\System32\en-GB\
sffp_mmc.sys Small Form Factor MMC Protocol Driver Microsoft® Windows® Operating System (6.0.6000.16386) 15360 C:\Windows\System32\DriverStore\FileRepository\...
PresentationNative_v03... Dynamic Link Library Windows Vista 779136 C:\Windows\SysWOW64\


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